A chess player is asked "What do you think, when you hear the expression K&K?”
99.9% of them answers "Why, famous contenders Karpov and Kasparov of course".
The remaining 0.1% will say "Without doubt the legendary pair of composers, Kohtz and Kockelkorn."

Indeed these two gentlemen are regarded as founding fathers of the Neogerman or Logical school of thought in chess problems.

The composition # 1649 by K&K is historically famous and has a name "Eine Schwalbe macht noch keinen Sommer" (One swallow does not make a summer). This name has symbolic value in two levels:
Firstly it refers to the fact that this composition was published in 1911 by elderly K&K after a long pause - and the solvers wanted more of the same.
Secondly it refers indirectly to the solution of the problem - one decoy (Lenkung) may not be enough.

Be this as it may, the German problemists have honored both K&K as well as this problem by naming their, currently world-famous, publication "Die Schwalbe"._________________There are only three kinds of chessplayers - those who can count and those who cannot....